I have a sort of extreme situation (I tow a double child trailer up a very steep hill), so I've done more to my Xootr Swift gearing than you necessarily need to. I've got a SRAM Dual Drive and an 11-32 cassette.
I think the stock cassette is 11-28. If you wanted a little better hill gearing, you might just swap it for an 11-32. The SRAM Dual Drive is probably way overkill for you.
I also don't like the stock handlebar (it's so narrow that I find it very difficult to control on that same hill), and I'm in the middle of figuring out what to replace it with. I have a
Dimension Arc coming Thursday.
Hope that's useful. (And the ongoing saga of my Swift is
here.)